Support module imports using a qualified name (#3608)

This change allows for importing modules using a qualified name and deals with any conflicts on the way.
Given a module C defined at `A/B/C.enso` with
```
type C
type C a
```
it is now possible to import it as
```
import project.A
...
val x = A.B.C 10
```

Given a module located at `A/B/C/D.enso`, we will generate
intermediate, synthetic, modules that only import and export the successor module along the path.
For example, the contents of a synthetic module B will look like
```
import <namespace>.<pkg-name>.A.B.C
export <namespace>.<pkg-name>.A.B.C
```
If module B is defined already by the developer, the compiler will _inject_ the above statements to the IR.

Also removed the last elements of some lowercase name resolution that managed to survive recent
changes (`Meta.Enso_Project` would now be ambiguous with `enso_project` method).

Finally, added a pass that detects shadowing of the synthetic module by the type defined along the path.
We print a warning in such a situation.

Related to https://www.pivotaltracker.com/n/projects/2539304

# Important Notes
There was an additional request to fix the annoying problem with `from` imports that would always bring
the module into the scope. The changes in stdlib demonstrate how it is now possible to avoid the workaround of
```
from X.Y.Z as Z_Module import A, B
```
(i.e. `as Z_Module` part is almost always unnecessary).

CHANGELOG.md

@@ -297,6 +297,7 @@
 - [Remove `here` and make method name resolution case-sensitive][3531]
 - [Explicit `self`][3569]
 - [Added benchmarking tool for the language server][3578]
+- [Support module imports using a qualified name][3608]
 
 [3227]: https://github.com/enso-org/enso/pull/3227
 [3248]: https://github.com/enso-org/enso/pull/3248
@@ -332,6 +333,7 @@
 [3538]: https://github.com/enso-org/enso/pull/3538
 [3538]: https://github.com/enso-org/enso/pull/3569
 [3578]: https://github.com/enso-org/enso/pull/3578
+[3608]: https://github.com/enso-org/enso/pull/3608
 
 # Enso 2.0.0-alpha.18 (2021-10-12)
 

distribution/lib/Standard/Base/0.0.0-dev/src/Data/Ordering/Comparator.enso

@@ -1,6 +1,6 @@
 from Standard.Base import all
 import Standard.Base.Data.Ordering.Natural_Order
-from Standard.Base.Data.Text.Text_Ordering as Text_Ordering_Module import Text_Ordering
+from Standard.Base.Data.Text.Text_Ordering import Text_Ordering
 
 polyglot java import org.enso.base.ObjectComparator
 

distribution/lib/Standard/Base/0.0.0-dev/src/Data/Text/Extensions.enso

@@ -8,10 +8,9 @@ import Standard.Base.Data.Text.Matching_Mode
 import Standard.Base.Data.Text.Case
 import Standard.Base.Data.Text.Location
 import Standard.Base.Data.Text.Line_Ending_Style
-from Standard.Base.Data.Text.Span as Span_Module import Span
+import Standard.Base.Data.Text.Span as Span_Module
 import Standard.Base.Data.Text.Text_Sub_Range
-from Standard.Base.Data.Text.Encoding as Encoding_Module import Encoding, Encoding_Error
-from Standard.Base.Error.Problem_Behavior as Problem_Behavior_Module import Problem_Behavior, Report_Warning
+from Standard.Base.Error.Problem_Behavior import Report_Warning
 import Standard.Base.Data.Locale
 import Standard.Base.Meta
 

distribution/lib/Standard/Base/0.0.0-dev/src/Data/Text/Matching.enso

@@ -2,7 +2,7 @@ from Standard.Base import all
 
 import Standard.Base.Data.Locale
 import Standard.Base.Data.Text.Regex
-from Standard.Base.Error.Problem_Behavior as Problem_Behavior_Module import Problem_Behavior, Report_Warning
+from Standard.Base.Error.Problem_Behavior import Problem_Behavior, Report_Warning
 from Standard.Base.Error.Common import Wrapped_Dataflow_Error
 
 ## UNSTABLE

distribution/lib/Standard/Base/0.0.0-dev/src/Data/Text/Regex/Engine/Default.enso

@@ -41,7 +41,6 @@ import Standard.Base.Data.Text.Regex.Option as Global_Option
 import Standard.Base.Data.Text.Regex.Mode
 import Standard.Base.Data.Text.Matching_Mode
 import Standard.Base.Polyglot.Java
-from Standard.Base.Data.Text.Span as Span_Module import Utf_16_Span
 
 polyglot java import java.lang.IllegalArgumentException
 polyglot java import java.lang.IndexOutOfBoundsException

distribution/lib/Standard/Base/0.0.0-dev/src/Main.enso

@@ -33,7 +33,6 @@ import project.IO
 import project.Nothing
 import project.Math
 import project.Meta
-import project.Meta.Enso_Project
 import project.Polyglot
 import project.Polyglot.Java
 import project.Runtime
@@ -89,13 +88,12 @@ from project.Data.Range export all
    https://www.pivotaltracker.com/story/show/181309938
 from project.Data.Text.Extensions export Text, Line_Ending_Style, Case, Location
 from project.Data.Text.Matching export Case_Insensitive, Text_Matcher, Regex_Matcher, No_Matches_Found
-from project.Data.Text export all
+from project.Data.Text export all hiding Encoding, Span, Text_Ordering
 from project.Data.Text.Encoding export Encoding, Encoding_Error
 from project.Data.Text.Text_Ordering export all
 from project.Data.Text.Span export all
 from project.Error.Common export all
 from project.Function export all
-from project.Meta.Enso_Project export all
 from project.Nothing export all
 from project.Polyglot export all
 from project.Runtime.Extensions export all

distribution/lib/Standard/Base/0.0.0-dev/src/System/File.enso

@@ -6,13 +6,10 @@ import Standard.Base.System.File.File_Permissions
 import Standard.Base.Error.Problem_Behavior
 import Standard.Base.Data.Text.Matching_Mode
 import Standard.Base.Data.Text.Text_Sub_Range
-from Standard.Base.Data.Text.Encoding as Encoding_Module import Encoding, Encoding_Error
-from Standard.Base.Error.Problem_Behavior as Problem_Behavior_Module import Problem_Behavior, Report_Warning
+from Standard.Base.Error.Problem_Behavior import Report_Warning
 import Standard.Base.Runtime.Resource
 from Standard.Base.Runtime.Resource import Managed_Resource
-from Standard.Base.Data.Time as Time_Module import Time
-
-export Standard.Base.System.File.Option
+from Standard.Base.Data.Time import Time
 
 polyglot java import org.enso.base.Array_Utils
 polyglot java import org.enso.base.Encoding_Utils

distribution/lib/Standard/Database/0.0.0-dev/src/Connection/Database.enso

@@ -1,6 +1,6 @@
 from Standard.Base import all
 
-from Standard.Database.Connection.Connection_Options as Connection_Options_Module import Connection_Options
+from Standard.Database.Connection.Connection_Options import Connection_Options
 
 import Standard.Database.Connection.Postgres
 import Standard.Database.Connection.SQLite

distribution/lib/Standard/Database/0.0.0-dev/src/Connection/Postgres.enso

@@ -4,7 +4,7 @@ from Standard.Base.Data.Numbers import Parse_Error
 
 import Standard.Database.Data.Dialect
 import Standard.Database.Connection.Connection
-from Standard.Database.Connection.Credentials as Credentials_Module import Credentials
+from Standard.Database.Connection.Credentials import Credentials
 import Standard.Database.Connection.Connection_Options
 import Standard.Database.Connection.SSL_Mode
 from Standard.Database.Connection.SSL_Mode import all

distribution/lib/Standard/Database/0.0.0-dev/src/Connection/Redshift.enso

@@ -2,7 +2,7 @@ from Standard.Base import all
 
 import Standard.Database.Data.Dialect
 import Standard.Database.Connection.Connection
-from Standard.Database.Connection.Credentials as Credentials_Module import Credentials
+from Standard.Database.Connection.Credentials import Credentials
 import Standard.Database.Connection.Connection_Options
 import Standard.Database.Connection.SSL_Mode
 from Standard.Database.Connection.SSL_Mode import all

distribution/lib/Standard/Database/0.0.0-dev/src/Data/Column.enso

@@ -9,7 +9,7 @@ import Standard.Table.Data.Sort_Column
 
 from Standard.Database.Data.Sql import Sql_Type
 from Standard.Database.Data.Table import Integrity_Error
-from Standard.Database.Error as Database_Errors import Unsupported_Database_Operation_Error
+from Standard.Database.Error import Unsupported_Database_Operation_Error
 
 type Column
 

distribution/lib/Standard/Database/0.0.0-dev/src/Data/Dialect/Postgres.enso

@@ -3,11 +3,12 @@ from Standard.Base import all
 import Standard.Base.Error.Common as Errors
 from Standard.Table.Data.Aggregate_Column import all
 from Standard.Database.Data.Sql import Sql_Type
+import Standard.Database.Data.Sql
 import Standard.Database.Data.Dialect
 import Standard.Database.Data.Dialect.Helpers
 import Standard.Database.Data.Internal.Base_Generator
 import Standard.Database.Data.Internal.IR
-from Standard.Database.Error as Database_Errors import Unsupported_Database_Operation_Error
+from Standard.Database.Error import Unsupported_Database_Operation_Error
 
 ## PRIVATE
 

distribution/lib/Standard/Database/0.0.0-dev/src/Data/Dialect/SQLite.enso

@@ -2,11 +2,12 @@ from Standard.Base import all
 
 from Standard.Table.Data.Aggregate_Column import all
 from Standard.Database.Data.Sql import Sql_Type
+import Standard.Database.Data.Sql
 import Standard.Database.Data.Dialect
 import Standard.Database.Data.Dialect.Helpers
 import Standard.Database.Data.Internal.Base_Generator
 import Standard.Database.Data.Internal.IR
-from Standard.Database.Error as Database_Errors import Unsupported_Database_Operation_Error
+from Standard.Database.Error import Unsupported_Database_Operation_Error
 
 ## PRIVATE
 

distribution/lib/Standard/Database/0.0.0-dev/src/Data/Internal/Aggregate_Helper.enso

@@ -1,10 +1,10 @@
 from Standard.Base import all
-from Standard.Base.Data.Text.Text_Ordering as Text_Ordering_Module import Text_Ordering
+from Standard.Base.Data.Text.Text_Ordering import Text_Ordering
 
 from Standard.Table.Data.Aggregate_Column import all
 import Standard.Database.Data.Internal.IR
 from Standard.Database.Data.Sql import Sql_Type
-from Standard.Database.Error as Database_Errors import Unsupported_Database_Operation_Error
+from Standard.Database.Error import Unsupported_Database_Operation_Error
 
 ## PRIVATE
    Creates an `Internal_Column` that computes the specified statistic.

distribution/lib/Standard/Database/0.0.0-dev/src/Data/Internal/Base_Generator.enso

@@ -4,7 +4,7 @@ import Standard.Database.Data.Sql
 import Standard.Database.Data.Internal.IR
 
 from Standard.Database.Data.Sql import Sql_Type
-from Standard.Database.Error as Database_Errors import Unsupported_Database_Operation_Error
+from Standard.Database.Error import Unsupported_Database_Operation_Error
 
 type Internal_Dialect
 

distribution/lib/Standard/Database/0.0.0-dev/src/Data/Internal/Helpers.enso

@@ -1,7 +1,7 @@
 from Standard.Base import all
 
-from Standard.Database.Data.Table as Table_Module import Table
-from Standard.Database.Data.Column as Column_Module import Column
+from Standard.Database.Data.Table import Table
+from Standard.Database.Data.Column import Column
 
 polyglot java import java.util.regex.Pattern
 

distribution/lib/Standard/Database/0.0.0-dev/src/Data/Table.enso

@@ -14,14 +14,14 @@ import Standard.Base.System.File.Existing_File_Behavior
 
 import Standard.Table.Data.Aggregate_Column
 import Standard.Table.Internal.Aggregate_Column_Helper
-from Standard.Database.Data.Column as Column_Module import Column, Aggregate_Column_Builder
+from Standard.Database.Data.Column import Column, Aggregate_Column_Builder
 from Standard.Database.Data.Internal.IR import Internal_Column
 from Standard.Table.Data.Table import No_Such_Column_Error
-from Standard.Table.Data.Column_Selector as Column_Selector_Module import Column_Selector, By_Index
-from Standard.Base.Data.Text.Text_Ordering as Text_Ordering_Module import Text_Ordering
-from Standard.Table.Data.Data_Formatter as Data_Formatter_Module import Data_Formatter
-from Standard.Base.Error.Problem_Behavior as Problem_Behavior_Module import Problem_Behavior, Report_Warning
-from Standard.Database.Error as Database_Errors import Unsupported_Database_Operation_Error
+from Standard.Table.Data.Column_Selector import Column_Selector, By_Index
+from Standard.Base.Data.Text.Text_Ordering import Text_Ordering
+from Standard.Table.Data.Data_Formatter import Data_Formatter
+from Standard.Base.Error.Problem_Behavior import Problem_Behavior, Report_Warning
+from Standard.Database.Error import Unsupported_Database_Operation_Error
 import Standard.Table.Data.Column_Name_Mapping
 import Standard.Table.Data.Position
 import Standard.Table.Data.Sort_Column_Selector

distribution/lib/Standard/Searcher/0.0.0-dev/src/Data_Science/Preparation.enso

@@ -11,7 +11,7 @@
      Get the item name and price columns from the shop inventory.
 
          import Standard.Examples
-         from Standard.Table.Data.Column_Selector as Column_Selector_Module import By_Name
+         from Standard.Table.Data.Column_Selector import By_Name
 
          example_select =
              Examples.inventory_table.select_columns (By_Name ["item_name", "price"])

distribution/lib/Standard/Table/0.0.0-dev/src/Data/Aggregate_Column.enso

@@ -1,6 +1,6 @@
 from Standard.Base import all
 
-from Standard.Table.Data.Column as Column_Module import Column
+from Standard.Table.Data.Column import Column
 import Standard.Table.Data.Column_Selector
 import Standard.Table.Data.Sort_Column_Selector
 

distribution/lib/Standard/Table/0.0.0-dev/src/Data/Data_Formatter.enso

@@ -1,8 +1,8 @@
 from Standard.Base import all
 
-from Standard.Base.Data.Time as Time_Module import Time
-from Standard.Base.Data.Time.Time_Of_Day as Time_Of_Day_Module import Time_Of_Day
-from Standard.Table.Data.Column_Type_Selection as Column_Type_Selection_Module import Auto
+from Standard.Base.Data.Time import Time
+from Standard.Base.Data.Time.Time_Of_Day import Time_Of_Day
+from Standard.Table.Data.Column_Type_Selection import Auto
 import Standard.Base.Error.Common as Errors
 import Standard.Base.Error.Problem_Behavior
 import Standard.Table.Data.Storage

distribution/lib/Standard/Table/0.0.0-dev/src/Data/Table.enso

@@ -14,12 +14,12 @@ import Standard.Table.Internal.Delimited_Reader
 import Standard.Table.Internal.Delimited_Writer
 import Standard.Table.Internal.Problem_Builder
 
-from Standard.Table.Data.Column_Selector as Column_Selector_Module import Column_Selector, By_Index
-from Standard.Table.Data.Column_Type_Selection as Column_Type_Selection_Module import Column_Type_Selection, Auto
-from Standard.Table.Data.Data_Formatter as Data_Formatter_Module import Data_Formatter
-from Standard.Base.Data.Text.Text_Ordering as Text_Ordering_Module import Text_Ordering
-from Standard.Base.Error.Problem_Behavior as Problem_Behavior_Module import Problem_Behavior, Report_Warning
-from Standard.Table.Errors as Error_Module import Missing_Input_Columns, Column_Indexes_Out_Of_Range, Duplicate_Type_Selector
+from Standard.Table.Data.Column_Selector import Column_Selector, By_Index
+from Standard.Table.Data.Column_Type_Selection import Column_Type_Selection, Auto
+from Standard.Table.Data.Data_Formatter import Data_Formatter
+from Standard.Base.Data.Text.Text_Ordering import Text_Ordering
+from Standard.Base.Error.Problem_Behavior import Problem_Behavior, Report_Warning
+from Standard.Table.Errors import Missing_Input_Columns, Column_Indexes_Out_Of_Range, Duplicate_Type_Selector
 import Standard.Table.Data.Match_Columns
 
 import Standard.Table.Data.Column_Name_Mapping

distribution/lib/Standard/Table/0.0.0-dev/src/IO/Excel.enso

@@ -1,11 +1,11 @@
 from Standard.Base import all
-from Standard.Base.Error.Problem_Behavior as Problem_Behavior_Module import Problem_Behavior
+from Standard.Base.Error.Problem_Behavior import Problem_Behavior
 import Standard.Base.System.File.Existing_File_Behavior
 import Standard.Base.System.File.Option
 from Standard.Table.IO.File_Format import Infer
 
 import Standard.Table.Data.Table
-from Standard.Table.Errors as Error_Module import Invalid_Location, Duplicate_Output_Column_Names, Invalid_Output_Column_Names, Range_Exceeded, Existing_Data, Column_Count_Mismatch, Column_Name_Mismatch
+from Standard.Table.Errors import Invalid_Location, Duplicate_Output_Column_Names, Invalid_Output_Column_Names, Range_Exceeded, Existing_Data, Column_Count_Mismatch, Column_Name_Mismatch
 import Standard.Base.Error.Common as Errors
 import Standard.Table.Data.Match_Columns
 

distribution/lib/Standard/Table/0.0.0-dev/src/IO/File_Format.enso

@@ -4,14 +4,14 @@ import Standard.Table
 import Standard.Base.Error.Common as Errors
 import Standard.Base.System
 import Standard.Table.Data.Match_Columns
-from Standard.Base.Error.Problem_Behavior as Problem_Behavior_Module import Problem_Behavior
-from Standard.Base.Data.Text.Encoding as Encoding_Module import Encoding
+from Standard.Base.Error.Problem_Behavior import Problem_Behavior
+from Standard.Base.Data.Text.Encoding import Encoding
 import Standard.Base.Runtime.Ref
 import Standard.Table.Internal.Delimited_Reader
 import Standard.Table.Internal.Delimited_Writer
-from Standard.Table.Errors as Table_Errors import Unsupported_File_Type
+from Standard.Table.Errors import Unsupported_File_Type
 
-from Standard.Table.Data.Data_Formatter as Data_Formatter_Module import Data_Formatter
+from Standard.Table.Data.Data_Formatter import Data_Formatter
 import Standard.Table.IO.Excel as Excel_Module
 import Standard.Table.IO.Quote_Style
 

distribution/lib/Standard/Table/0.0.0-dev/src/IO/File_Read.enso

@@ -1,5 +1,5 @@
 from Standard.Base import all
-from Standard.Base.Error.Problem_Behavior as Problem_Behavior_Module import Problem_Behavior, Report_Warning
+from Standard.Base.Error.Problem_Behavior import Problem_Behavior, Report_Warning
 
 import Standard.Table.IO.File_Format
 

distribution/lib/Standard/Table/0.0.0-dev/src/Internal/Aggregate_Column_Helper.enso

@@ -1,8 +1,8 @@
 from Standard.Base import all
 
-from Standard.Table.Data.Column as Column_Module import Column
+from Standard.Table.Data.Column import Column
 from Standard.Table.Data.Aggregate_Column import all
-from Standard.Table.Data.Column_Selector as Column_Selector_Module import Column_Selector, By_Name, By_Index, By_Column
+from Standard.Table.Data.Column_Selector import Column_Selector, By_Name, By_Index, By_Column
 import Standard.Table.Internal.Problem_Builder
 import Standard.Table.Internal.Unique_Name_Strategy
 import Standard.Table.Internal.Table_Helpers
@@ -12,7 +12,7 @@ import Standard.Table.Data.Sort_Column
 
 import Standard.Base.Data.Ordering.Comparator
 
-from Standard.Table.Errors as Error_Module import Missing_Input_Columns, Column_Indexes_Out_Of_Range, No_Output_Columns, Duplicate_Output_Column_Names, Invalid_Output_Column_Names, Invalid_Aggregation, Floating_Point_Grouping, Unquoted_Delimiter, Additional_Warnings
+from Standard.Table.Errors import Missing_Input_Columns, Column_Indexes_Out_Of_Range, No_Output_Columns, Duplicate_Output_Column_Names, Invalid_Output_Column_Names, Invalid_Aggregation, Floating_Point_Grouping, Unquoted_Delimiter, Additional_Warnings
 
 polyglot java import org.enso.table.aggregations.Aggregator
 polyglot java import org.enso.table.aggregations.Concatenate as ConcatenateAggregator

distribution/lib/Standard/Table/0.0.0-dev/src/Internal/Delimited_Reader.enso

@@ -3,11 +3,11 @@ import Standard.Table
 
 import Standard.Base.Data.Statistics
 import Standard.Base.Error.Common as Errors
-from Standard.Base.Error.Problem_Behavior as Problem_Behavior_Module import Problem_Behavior, Ignore, Report_Error
-from Standard.Table.Errors as Table_Errors import Duplicate_Output_Column_Names, Invalid_Output_Column_Names, Invalid_Row, Mismatched_Quote, Parser_Error, Additional_Invalid_Rows
-from Standard.Base.Data.Text.Encoding as Encoding_Module import Encoding, Encoding_Error
+from Standard.Base.Error.Problem_Behavior import Problem_Behavior, Ignore, Report_Error
+from Standard.Table.Errors import Duplicate_Output_Column_Names, Invalid_Output_Column_Names, Invalid_Row, Mismatched_Quote, Parser_Error, Additional_Invalid_Rows
+from Standard.Base.Data.Text.Encoding import Encoding, Encoding_Error
 from Standard.Table.IO.File_Format import Infer
-from Standard.Table.Data.Data_Formatter as Data_Formatter_Module import Data_Formatter
+from Standard.Table.Data.Data_Formatter import Data_Formatter
 import Standard.Table.IO.Quote_Style
 
 polyglot java import org.enso.base.encoding.NewlineDetector

distribution/lib/Standard/Table/0.0.0-dev/src/Internal/Delimited_Writer.enso

@@ -3,16 +3,17 @@ import Standard.Table
 
 import Standard.Base.Error.Common as Errors
 import Standard.Base.System
-from Standard.Base.Error.Problem_Behavior as Problem_Behavior_Module import Problem_Behavior
+from Standard.Base.Error.Problem_Behavior import Problem_Behavior
 import Standard.Base.System.File.Existing_File_Behavior
 from Standard.Table.Errors as Table_Errors import Duplicate_Output_Column_Names, Invalid_Output_Column_Names, Invalid_Row, Mismatched_Quote, Parser_Error, Additional_Invalid_Rows, Column_Count_Mismatch, Column_Name_Mismatch
-from Standard.Base.Data.Text.Encoding as Encoding_Module import Encoding, Encoding_Error
+from Standard.Base.Data.Text.Encoding import Encoding, Encoding_Error
 from Standard.Table.IO.File_Format import Infer
-from Standard.Table.Data.Data_Formatter as Data_Formatter_Module import Data_Formatter
+from Standard.Table.Data.Data_Formatter import Data_Formatter
 import Standard.Table.Data.Storage
 import Standard.Table.IO.Quote_Style
 import Standard.Base.Data.Text.Line_Ending_Style
 from Standard.Table.Internal.Delimited_Reader import Existing_Headers, No_Headers
+import Standard.Table.Internal.Delimited_Reader
 import Standard.Table.Data.Match_Columns
 
 polyglot java import org.enso.table.write.DelimitedWriter

distribution/lib/Standard/Table/0.0.0-dev/src/Internal/Problem_Builder.enso

@@ -1,10 +1,10 @@
 from Standard.Base import all
 
-from Standard.Base.Error.Problem_Behavior as Problem_Behavior_Module import Problem_Behavior, Report_Warning
+from Standard.Base.Error.Problem_Behavior import Problem_Behavior, Report_Warning
 import Standard.Base.Runtime.Ref
 import Standard.Table.Internal.Vector_Builder
 
-from Standard.Table.Errors as Error_Module import Missing_Input_Columns, Column_Indexes_Out_Of_Range, No_Output_Columns, Duplicate_Column_Selectors, Input_Indices_Already_Matched, Too_Many_Column_Names_Provided, Duplicate_Output_Column_Names, Invalid_Output_Column_Names, Column_Matched_By_Multiple_Selectors
+from Standard.Table.Errors import Missing_Input_Columns, Column_Indexes_Out_Of_Range, No_Output_Columns, Duplicate_Column_Selectors, Input_Indices_Already_Matched, Too_Many_Column_Names_Provided, Duplicate_Output_Column_Names, Invalid_Output_Column_Names, Column_Matched_By_Multiple_Selectors
 
 type Problem_Builder
     type Problem_Builder oob_indices duplicate_column_selectors input_indices_already_matched missing_input_columns other